Corner Tumor

Intracranial schwannomas constitute 8-10% of all intracranial tumors.

Intracranial schwannomas constitute 8-10% of all intracranial tumors. Vestibular schwannoma (VS), acoustic neuroma (AN), VIII. nerve schwannoma, peripheral glioma are called with different names such as the most commonly used name is VS . It is also called a corner tumor because it is seen in the cerebellopontine angle (around the corner). Cerebellopontin angle (CPA) is the most common tumor and is seen in 75-90%. It is more common in women. It is usually diagnosed after the age of 30 because of its benign and slow growth. The mean time from the onset of hearing to the diagnosis of the disease was reported to be 3.5-4 years. Two types are monitored:

  • Antony A: Fascial Type: Cells parallel to each other are located in regular order. Palisad appearance is used for this cell type.
  • Antony B: Reticular Type: Loosely reticular location is characterized by less cellular elements and more irregular alignment of the nuclei.
  • Who Are Under Risk?

    • Neurofibromatosis type 2 (NF2) patients - a disease with familial transition. If there is NF2 in family members, the risk of developing acoustic neurinoma is higher than the ones without.
    • People who spend a long time in noisy environments - work noise or loud music can cause this situation.
    • Persons who received radiotherapy treatment in the head and neck region during childhood


    • Hearing loss - may take many years to develop, so the person may not be aware of the hearing loss and usually starts asymmetrically.
    • Tinnitus, buzzing
    • Balance problems during walking
    • One side of the sense of wobble
    • Facial symptoms; percent numbness, pain, difficulty in moving a part of the face

    What are Diagnostic Tests?

    • Audiogram; it is performed by an audiologist and the hearing is evaluated by the person's responses to the test.
    • BERA; is a test performed while a person is sleeping, a more objective test than an audiogram.
    • MR / CT; The mass can be detected by imaging methods.

    What Is The Treatment?

    • If the mass can be removed by protecting the hearing with the surgical method, however, if the hearing loss has already developed, the recovery of the hearing after surgery is not expected.
    • High dose X-ray is given by radiotherapy.
    • Tracking; If the mass is monitored by the imaging methods, if there is growth in the mass or when the mass starts to give symptoms, surgery or radiotherapy can be performed.
    If the patient is young or has a large or advanced hearing loss, the physician may recommend a surgical or radiotherapy method. If the patient is older, the size of the mass is small or the hearing loss is mild / mild, the physician may recommend follow-up. Acoustic Neurinoma may recur after surgery / radiotherapy. Follow-up MRI / CT may be required for up to 10 years after treatment.